I’ve definitely walked out of a supermarket with a bottle of water that I picked up while shopping and forgot to pay for - I still stole it, even if unintentionally.
You only steal it if you realize it and don't return back to pay. Happened with me a few times, the cashiers will really appreciate it.
A while ago my to-go order from McD somehow included an extra cheeseburger.
Was that maybe a "present" by the company to a loyal customer? Should I have gone back and paid for a cheeseburger I never ordered? But if I give it back to them, they would just throw it in the trash anyway because they can't sell it to another customer.
You probably have stolen something, even if it's just a failure to return a book you borrowed from someone, or office supplies that wandered off with you (pens vanish like you wouldn't belive).
Isn't this a fairly wild claim? I've never stolen anything and can't imagine doing so. That's a pretty dismal view of the human race isn't it.